Writing-machine.



N0. 856,869. PATENTED JUNE 11, 1907.

E. B. HESS.

WRITING MACHINE.

APPLICATION FILED rms. 1a. 1906.

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N0.'s5s.s69. PATENTED JUNE 11, 1907. E. B. HESS.

WRITING MACHINE.

APPLIUATION rmm r113. 1a. 1906.

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UNITED STATES PATENT OFFICE.

EDWARDB. HESS, OF NEW YORK, N. Y., ASSIGNOR TO ROYAL TYPEWRITER COMPANY, OF HOBOKEN, NEW JERSEY, A CORPORATION OF NEW WRITINGw-IVIACHINE.

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Specification of Letters Patent.

Patented June 11, 1907.

Application filed P ebruary 16,1906. Serial No. 801,862.

A To' all rohom it may concern:

Be it known that I, EnwARD B. I-Inss, a citizen of the United States'of America, re-

siding i'n the borough of Brooklyn, city and State of'New York, have invented certain Improvements inWriting-Machines, of which the following is a specification.

This inv ntion relates to line space devices for a? rotatable cylinder bar typewritm machine and consists of novel features .o construction. hereinafter set out in detail.

' In the accompanying drawing: Figure 1 is a plan viewof the eft hand end of a platen and associated parts; Fig. 2, an end elevation thereof: Fig. 3, a front elevation: '4, a section on the line 4, 4, of Fig. 3 and F1 5 a detail transverse section taken ust 1I1S1 e I the side plate on the general line 5, 5, of

ratchet wheel d. 1 I ltli e outer side of the ratchet wheel and rocking looselyI upon the hub thereof is a radial. arm If in e end of which is pivoted a push- .paw constantly drawn toward the periphery o the ratchet wheel by a coiled spring h.

Pivoted in. a bracket on the carria e side thumb piece.

arm f. elbow lever 1s pushe plate in rear of the platen is an elbow lever the lon er end of which extends toward the front 0 the machine and is provided with a Its shorter arm 1', is con b a link with the rockin radial When the lon arm of the be lcrank inwardly, or toward the end of the platen, link it carries arm f rearwardly and pawl g engaging a tooth of the ratchet-W111 move itthe desired distance for spacing the printing lines upon the platen. A spring supported yielding roller detent or stop m bears upon the eriphery of the nected ratchet wheel and holds it in the position to which it may be thrown by the push pawl, and against movement by reason of frictional contact of the pawl with the ratchet'wheel on the return movement of the pawl.- The elbow lever is restored to normal position by T d aflbrd variation of linespace, a rocking guard or shield o is applied to the ratchet wheel and by its position determines-the point in the stroke of pawl g at which it engages a tooth of the ratchet wheel. j This shield consists of a plate mounted to rock upon the ratchet wheel hub on the inner side the wheel. A ortion of the plate, constituting the rate et guard, is of a radius slightly in excess of that of the ratchet Wheel and is circular throughout approximately a half diameter and is formed with an overturned flange like portion 0 embracing the periphery o the ratchet wheel but cut away at 0 (Fig. 3) to permit play of the rockin radial arm 1. Another portion of the guar plate, also of greater radius than the ratchet wheel, is provided with a series of notches 2, 3 and a cam part 4 of still greater radius.

1 The edge of this latter part of the rockin guard plate is engaged by a projecting en of the shaft 1) of yielding roller detent m acting upon the ratchet wheel. These parts are so related that when the roller is pressedinto the space between the points of two ratchet teeth and so tends to hold the ratchet wheel in position, the end of shaft p rests in one of the notches in .the edge of the guard plate and retains the latter in position. Expe rience has shown that this arrangement of 'what is practically the same detent actin simultaneously upon the ratchet wheel and guard plate in the same radial lines and substantially diametrically opposite the push;

pawl, has advantages not only on the score of economy of construction but affords also improved operation. In the position. shown in the drawings when the pawl moves forward it will engage ratchet tooth (Fig 4) and move the ratchet wheel through a space represented by three of its teeth. In this position, the shaft p is seated in notch 1 of the guard. When t e guard, by means of' its handle 0 is moved to carry its upper edge forward (or in the direction of thrust of pawl g) until shaft p rests in notch 2, then the pawl will engage ratchet q and throw the ratchet a space represented by two of its teeth. When the guard is further swung to brin the shaft 1) in. the notch 3, then the paw will engage ratchet q and move ratchet wheel through a space represented by one tooth only. When the guard is further moved until shaft p runs out on the portion 4 throw.

ol the guard; the detent m. is held out of engagement with the teeth of the ratchet wheel and the push pawl g, it operated, will not engage any tooth of the ratchet. With the parts in this position, the platen may, by means of the usual thumb wheel, be set for printing upon any line.

In the use of a typewriting machine the operator has some particular line space commonly used by him amlwhen for solne special work he has thrown the shield to disengage the ratchet from its detent and hold the pawl out of operative engagement with the ratchet for the purpose already described; it is desirable that in returning the shield to normal position its movement shou'dbe limited by a positive stop. This maybe accomplished in a variety of ways: one that experience has shown to be convenient and ellicient is disclosed in Fig. 2. On the outer face of the side plate a is a horizontally movable slotted stop plate 1" held in any adjusted position by a set screw 7". Its upturned end is formed with two stop surfaces .9, 8. When this plate is in the retracted position indicated in the position shown in Fig. 2, the shield may be moved freely in either direction to the full extent of its If, however, plate 1 is projected so that its stop surface s isfin the path of the part 0 of the shield handle, the shield will be arrested in such position that permits the push pawl to move the ratchet wheel through a space represented by one tooth; and if the stop plate r is adjusted so that its surface s .is in the path of the handle, the shield will be arrested in such position that the push pawl will move the ratchet through a space repsented-by two of its teeth. The figures 0, 1, 2, 3 are placed upon the flange of the shield as shown, in Fig-1' 3,- the figure insight at the top of the series indicating the operative position of the shield. Thus, in Fig. 3, it appears that the parts are in position for the platen to be moved. through a space represented by three of the ratchet teeth. It the shield were moved upwardly as viewed in this figure, so thatthe figure 2 occupies-the position in which 3 now stands, the indication would he that the platen would be moved through a space represented by two ratchet te'eth. As is well understood, the roller ratchet detent pressing into the intervals between points of adjacent teeth serves to justify or aline the platen in the event of slight overthrow or slightly inadequate extent of movement of the ratchet wheel by its operating means.

- ,Theprojections t,'t at the respective ends of the notched projecting edge of the guard serve by enga ing the pintle p to determine the throw of tlie latter. i i

I claim-as my inventior'i: h 1. L'ne space devices for a writing machine; comprising the combination of a platen and its ratchet wheel,-arrn rocking v about the axis of the wheel, a push pawl pivoted in theend of the arm and arranged in the plane of the ratchetwheel, a spring normally tending to draw the'pawl intoengagsment with the wheel, a shield rocking about,

hold it in determined .positionto which it may be moved and a s'e'conddetentoperating which itm'ay be adjusted.-

I Line space devices-fora \vriting machine, comprising a 'rotatable'platen. and its upon the shield to hold it irithe position to ratchet wheel, a pawl actuated to engage and move the ratchet wheel, a shield determining the point in the stroke of the pawl at which it shall engage the wheel,- two detents respe r-. tively engaging the ratchet wheel and shield for the purpose set forth, and a yieldingsup port by which both detents are carried.

Line space devices for a writing machine, comprising the combination ofa rota table platen and its ratchet, a pawl actuated to engage and. move) the ratchet, a yielding detent acting upon the ratchet, an adjustable shield applied to the ratchetto determine the point in the stroke of the pawl at which it shall engage the ratchet and having an edge with notches one for each position of the shield and a cam part, a yielding detent adapted to engage such notches and cam partand "means whereby when such detent engages the latter surface the detent of the ratchet wheel is thrown out of engagement with it. p

4. Line space devices for a writing ma chine, comprising the combination of a rotatable platen and its ratchet','a pawl actuated to engage the ratchet to partially rotate it, a shield rocking about the axis of the ratchet and having two portions, one serving as a guard-to determine the point in the throw of the pawl at which it shall engage the ratchet wheel, and another portionhaving notches and a surface .4 of greater radius, a yielding arm, two detents carried'thereby, one acting on the ratchet wheel and the other ,upon the last named portionoi the guard, the arrangement'being such that the ratchet detent rcmains in operative relation to the ratchcts in all positions of the guard, except that in which the guard dct-entengages the surface 4 when the. ratchet detent is carried out ol cm gagemcnt with the ratchet wheel.

5. Line space devices for a writing machine,'c0mprising the combination of a rotatable platen, and its ratchet, 1neans for rotating the ratchet through variable distances to determine the line space, a guard rocking about the axis of the ratchet and acting to determine the tooth of the ratchet that shall be engaged by the operating means to there by determine-the line space, such guard having a notched ed e'of greater radius than the ratchet wheel w ich edge has a portion 4 of still greater radius, a spring arm, and two detents carried thereby, one detent engagin the ratchet wheel and the other the edge 0 the last named portion of the guard, 'the parts operating substantially as described.

6. Line space devices for a writing macbine,,comprising the combination of a rotatable platen, its ratchet, a awl for actuatin' the ratchet through variab e distances to a ford difl'erent line s aces, an adjustable shield rocking about t e axis of the ratchet and having on one side of said axis a flange embracing the ratchet and normally interposed between it and the pawl and, on the other side of the axis, an'edge of greater- 20 shield, andmeans whereby when the portion 25 4 of the shield is moved to a sition to engage the shield detent the ratchet detent is thrown out of operative relation to the ratchet.

In testimony whereof, I have hereunto 3o subscribed my namet EDWARD B. HESS.

Witnesses:

EDWARD C. Davmsos, L. F. Bnowmsc. 

